JS: ECMAScript 2020

Variable for the global object, globalthis

• JS: globalThis

Nullish Coalescing Operator

• JS: Nullish Coalescing Operator (defined or)

Optional Chaining Operator

• JS: Optional Chaining Operator

String.prototype.matchAll

easier way to get all matches and all captures.

• JS: String.prototype.matchAll

Order of Properties

• JS: Order of Properties

bigint

A new number primitive for working with arbitrary precision integers.

const x = 10n;
console.log( typeof x === "bigint" ); // true

• JS: Primitive Value
• JS: Value Types
• JS: BigInt (class)

Dynamic import, the import() syntax

• JS: Dynamic Import

new syntax: import *

import * as xyz from "./xyz.js";

new syntax: export *

Dedicated export * as ns from 'module' syntax for use within modules.

• https://github.com/tc39/proposal-export-ns-from

import.meta

import.meta, a host- populated object available in Modules that may contain contextual information about the Module.

export {abc} from "./xyz.js";
export * from "./xyz.js";

• JS: Export
• JS: Static Import

Promise.allSettled

A new Promise combinator that does not short-circuit.

• JS: Promise Tutorial

Order of for-in loop

Increased standardization of for-in enumeration order.

• https://github.com/tc39/proposal-for-in-order

• JS: for-in Loop 👎